Atomic Structure and Radioactivity Crossword Puzzle

QUESTIONS LIST:

• gamma : least ionizing but hardest to stop radiation
• isotope : atoms with the same number of protons but a different number of neutrons
• beta : radiation made up of a fast-moving electron
• orbit : electrons _ the nucleus at fixed energy levels / shells
• electron : particle with negative charge
• alpha : most ionizing but easiest to stop radiation, made up of two protons and two neutrons
• half life : the time it takes for half of the unstable nuclei in a sample to decay
• atomic number : number of protons in an atom's nucleus
• neutron : particle with no charge
• mass number : number of protons and neutrons in an atom's nucleus
• proton : particle with positive charge